U.S. postal lookup

U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

42,735 verified records
All states and U.S. territories
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State directory

Michigan ZIP Codes

Complete postal directory, details, and geographic map for the State of Michigan.

State ZIP Code City County Area Codes
MI 49130 Union Cass County 269, 574
MI 49201 Jackson Jackson County 517
MI 49202 Jackson Jackson County 517
MI 49203 Jackson Jackson County 517
MI 49204 Jackson Jackson County 517
MI 49220 Addison Lenawee County 517
MI 49221 Adrian Lenawee County 517
MI 49224 Albion Calhoun County 269, 517
MI 49227 Allen Hillsdale County 517
MI 49228 Blissfield Lenawee County 419, 517, 567, 734
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About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.